Intel MPI 4.1.3 on RHEL6.4: trying to bind ranks in two simple fashions:(a) 2 ranks to the same processor socket and (b) 2 ranks to different processor sockets.
Looking at the Intel MPI Reference Manual (3.2. Process Pinning pp.98+), we should be able to use options in mpiexec.hydra when the hostfile points to the same host
-genv I_MPI_PIN 1 -genv I_MPI_PIN_PROCESSOR_LIST all:bunch
-genv I_MPI_PIN 1 -genv I_MPI_PIN_PROCESSOR_LIST all:scatter
Unfortunately, the "scatter" option STILL binds the MPI ranks to the same socket.
Should I be using the "I_MPI_PIN_DOMAIN" instead?